Armed with a 10-inch blade, this robber thought he had found an easy target when he attempted to raid a store.

But the attacker - wearing a hat similar to Paul Hogan in Crocodile Dundee - got more than he bargained for when a mother-of-one shop worker fought back, grabbing the man’s wrists and kneeing him in the groin.

CCTV cameras captured the moments when the robber held the knife to Amanda Williams’s throat and demanded money at a store near Mandurah, Perth, Western Australia.

Fighting back: Amanda Williams grabs the attacker's knife as he threatens her during an attempted robbery

The shop worker retaliates and knees the man in the groin

But the brave 40-year-old caught him by surprise when she turned around and hit out, then screamed for help. The man was then wrestled to the floor by members of the public.

Before he was arrested by police, Ms Williams told him: ‘You messed with the wrong chick, eh!’

Talking about the incident to Australia's Today Tonight TV show, she said: ‘He appeared in the store and demanded money.

‘He held the knife to my throat and threatened my life, so there was no way I wasn't going to fight back.

Attack: The man approaches Amanda Williams from behind and threatens her with a knife as he tries to rob the store in Australia

Determined: Ms Williams fights back against the would-be robber, who was wearing a mask and a Crocodile Dundee style hat

‘So I grabbed his wrist and kneed him in the groin. I thought a couple of knees to the groin would be enough.

‘It didn't seem to affect him so I screamed for help.’

Ms Williams, who has a nine-year-old son, then wrestled with the robber, banging against the shop counter.

Colleagues and members of the public rushed to her aid.

The robber dropped the knife and was dragged to the floor.

Brave: The mother-of-one recalls the incident on Australia's Today Tonight

Ms Williams added: ‘When he was on the floor I said to him, “You messed with the wrong chick, eh!”

‘I have seen the CCTV footage and I am shocked by what I did. I suppose the adrenalin kicked in and I just fought.

‘I didn't want anyone to walk all over me.’

The incident happened on Friday, May 28. The attacker has now been charged with attempted armed robbery.